prince



(No Model.)

L. L. CRANE & W. H. PRINCE.

SURFACE BLOW-OFF.

No. 403,919. Patented May 28, 1889.

N. PEIERS, mwmm mmw. Wuhlnghm. no.

UNITE STATES PATENT OFFICE.

LOCKlVOOD L. CRANE AND WILLIAM H. PRINCE, OF CLEVELAND, OHIO; SAID CRANE ASSIGNOR TO SAID PRINCE.

SURFACE BLOW-OFF.

SPECIFICATION forming part of Letters Patent No. 403,919, dated May 28, 1889.

Application filed December 4, 1886. Serial No. 220,694. (No model.)

To all whom it may concern:

Be it known that we,LOOKWOOD L. CRANE and WILLIAM H. PRINCE, citizen 5 of the United States, residing at Cleveland, county of Guyahoga, and State of Ohio, have invented certain new and useful Improvements in Surface Blow-Off Cocks; and we do hereby declare the following to be a description of the same and of the manner of constructing and using the invention in such full, clear, conoise, and exact terms as to enable any person skilled in the art to which it appertains to construct and use the same, reference being had to the accompanying drawings, forming a part of this specification, the principle of the invention being herein explained and the best mode in which we have contemplated applying that principle, so as to distinguish it from other inventions.

Our invention relates to improvements in surface blow-off cocks for steam-boilers.

The object of the invention is to provide a blow-off cock or valve which shall be selfregulating, the floating portion of which shall be continuously on the surface of the water in order to free the boiler of impurities in the water, which naturally rise to the surface when firing, and which may blow out of the boiler before the impurities are precipitated onto the tubes or shell of the boiler to incrustate the same.

Referring to the drawings, Figure 1 is a side elevation showing a boiler with our blowoff valve fitted in position. Fig. 2 is abottom perspective view of the fioat-connecting pipe. Fig. 3 is a detail view of the ball-joint union.

AA are two floats connected together by wire a, which are rigidly secured to escapepipe B. The open end 19 of this escape-pipe B is fan-shaped or like a flattened funnel. This mouth I) of the escape-pipe is strengthened against the steam-pressure by partitions 0, placed at short distances from each other perpendicular to the flattened portions of the pipe. Between the two ends of the escape-pipe an elbow-joint, z, is formed. This escape-pipe B is connected by a ball-joint union, D,to discharge-pipe C,which leads out of the boiler, said ball-joint union permitting the floats and escape-pipe to rise and fall with the rise and fall of the water in the boiler, said unionjoint consisting of conical bearing d, formed on the extremity of pipe B and provided with a shoulder, e, said bearing fitting in concave bearing f, formed in the adjoining extremity of the dischargepipe C, the nut gof the coupling being screwthreaded on the discharge-pipe and having free rotary movement on the escape-pipe. A set screw, h, is threaded in said nut and screwed down onto aplane portion of the end of the discharge-pipe to prevent the nut working loose as the floats rise and fall.

The pipe 0 leads out of the boiler at any suitable point and is provided with a globevalve, E, for blowing off.

The particular advantage of the vertical adjustment of the float-pipe is that it is kept constantly on the surface of the water no matter whether the water in the boiler be high or low, and thus when the valve is opened the scum or sediment constantly arising to the surface of the water as the water boils is blown out the pipe, and the precipitation of the same onto the tubes and shell of the boiler, and consequent incrustation of the latter, is prevented.

The vertical height of the escape-opening is so small that while it permits of the escape of the surface impurities, yet no considerable amount of water is drawn out with it. The float is preferably placed in vertical line with the bridge-wall of the fire-box, as this is the point of greatest heat in the boiler, and hence also the greatest amount of impurity is here to be found in the water, owing to the increased ebullition of the latter.

\Vhat we claim is In a surface blow-off cock, the combination, with a floating escape-pipe provided with a fan-shaped opening, arranged as shown, at its floating end, and a conical-shaped bearing at its opposite end having a collar, said escapepipe being provided with an angular formation intermediate between said mouth and conical bearing, of a discharge-pipe provided at its connecting end with a concave bearing be our invention We have hereunto set our and a nut fitting loosely on said collar and hands this 2d day of December, A. D. 1886.

screw-threaded on the adjoining end of the LOOKWOOD L. CRANE. discharge-pipe, said nut beingprovided with WILLIAM- H. PRINCE.

5 a set-screw adapted to engage with said dis- Witnesses:

charge-pipe, substantially as set forth. J. B. FAY,

In testimonythat we claim the foregoing to E. O. GLAsER. 

